While cruising (steady throttle) from 2000-2700rpm in any gear, I get "surging" from the engine, like it doesn't know if it wants to accelerate or slow down. No backfires or anything. If I hit the gas, it pulls hard and smooth. Runs fine at steady throttle in the rest of the RPM range.
BTW, It's a 2.0 4cyl with FI, newish vac hoses, Web cam with stock profile and that "GT" 4 pipe muffler everyone loves.
Any ideas of what it could be? From my knowledge, it seems like it's a lean condition but what's the fix?
Thanks for any info.